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Thread: how many ohms are your speakers

  1. #1
    Regular Member DennisTheMenace's Avatar
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    Default how many ohms are your speakers

    Just pulled the door card off as it sounds like one of me voice coils has had an argument with the back of the speaker , and found that its a 2 ohm speaker , are all the later cars 2 ohm or just ones fitted with the cdc 40 opera unit ?

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    Regular Member rich32's Avatar
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    i think most car speakers are 2 ohm where in your house youll find there 4 ohm i think

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    Regular Member DennisTheMenace's Avatar
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    No , cars are normaly 4 ohms , house speakers are 4-8 ohms sometimes 16 , mainly for surround sound speakers on cinema aurround systems .

    i expect its vauxhalls way of making the speakers louder without using a larger amplifier , cut the speakers impeadance in half and its therefore easier to drive

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    Regular Member rich32's Avatar
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    i see i just got a amp for my car to power the 3 10s and that is 1 ohm stable not that sure what its all about lol

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    Most domestic Hi Fi speakers are of 8 ohm nomminal impedence, car speakers appear to be 4 ohm while the twin voice coil models obviously can be 2 or 8 depending on whether they are connected in series or parallel.
    These figures are all nomimnal as it varies with frequency
    The nominal 4 ohm at 1Khz loudspeaker usually will be more than 4 at higher frequencies but lower than 4 at lower frequencies.
    Of course there are exceptions, I believe the Kicker SS65.2's in my car are 3 ohm whilst some EAW KF300z's I have are 6.

    The d.c. resistance of an 8 ohm loudspeaker is likely to be in the region of 5-6 ohms. Confusing is it not.

    None of this takes into account the passive crossover so lets ignore that.

    Most modern amplifiers are happy with loads of nominal 4 ohms impedence some of the better ones are happy at 2 ohms, I would not like to drive an amplifier into 1 ohm even though some makers claim it will be stable at this. It is also worth noting people think the sound of the amplifier will change with a change in load. I have to aggree with this.

    Cable also has an effect on this as it will introduce some DC resistance to the equation so effectively wasting some of the amplifiers power just getting to the speaker.

    It is OK if you wish you had not asked,

    Ian B.

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    Regular Member rich32's Avatar
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    no itys fine you should get a job at car hi fi shop lol if i run my amp at i ohm is it all about the way its wired up is it true it is louder at 1 ohm as it has a rms of 1400 at 1 ohm will this power my 3 10s what are rated at 800 each ? thanks

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    Denis you are possibly right, it is a cheap way in theory to make things louder half the impence you should be able to double the current to the speakers, however that is until you hit the limit of what is driving them. After that it is square waves to the speakers and the voice coil lights up for a brief second then a small puff of black smoke. the perfect quiet.

    As for working in a car audio shop, no thanks it is bad enough listening to people at concerts who come up and say " Here mate how many watts is this rig" to have sombody come up and say "I have 20Kw in my boot" sorry I want to kill them both.

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    Regular Member Ashtoroth's Avatar
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    Hiya

    I metered the spekers in my Signum (at the head unit) and the FR, RR LF, LR were all 4 ohm and the center was 8 ohm. The mid low might be 2ohm but im sure there is a passive crossover for the tweeter, when connected it might make the impeadiance 4 ohm.

    Ashtoroth

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    If it is the same as my 53 plate, there was no crossover componat for the low mids and just a very simple 1st order filter for the tweeters.
    As we know these systems are pretty cheap, though to be fair not bad.

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